ML19343D485
| ML19343D485 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 04/10/1981 |
| From: | Tedesco R Office of Nuclear Reactor Regulation |
| To: | Parris H TENNESSEE VALLEY AUTHORITY |
| References | |
| NUDOCS 8105040623 | |
| Download: ML19343D485 (4) | |
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LB#2 Reading App if afg ASchwencer Docket Nos. 50-327 CStahle and 50-328 MService RLTedesco Glainas TNovak Mr. H. G. Parris DEisenhut/RPurple Manager of Power OELD Tennessee Valley Authority ACRS(16) 500A Chestnut Street, Tower II
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Chattanooga, Tennessee 37401 Q EliA.3_
Dear Mr. Parris:
SUBJECT:
REQUF" *0R INFORMATION ON SEQUOYAH CHARGING PUMPS Enclosed are requests for information on minimum flow through the Sequoyah centrifugal charging pumps which is needed by April 20, 1981, in order to complete our review. Your staff was provided an infcrmal copy of these requests in February 1981.
This is in response to your letter of November 18,1980, whereby TVA determined that the prefered modifications in IEB80-18 constitute an unreviewed safety question.
Sincerely, Orfdnad signai br Baham I. Taisseo Robert L. Tedesco, Assistant Director O
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Division of Licensing
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Mr. H. G. Parris Manager of Power Tennessee Valley Authority 500A Chestnut Street Tower II Chattanooga, Tennessee 37401 cc: Herbert S. Sanger, Jr., Esq.
General Counsel Tennessee Valley Authority
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400 Connerce Avenue E llB 33 Knoxville, Tennessee 37902 Mr. H. N. Culver Tennessee Valley Authority 400 Conmerce Avenue, 249A HBB Knoxville, Tennessee 37902 Mr. Bob Faas Westinghouse Electric Corporation P. O. Box 355 Pittsburgh, Pennsylvania 15230 Mr. Mark Burzynski Tennessee Valley Authority 400 Chestnut Street Tower II Chattanooga, Tennessee 37401 Mr. J. F. Cox Tennessee Valley Authority 400 Commerce Avenue, W10Cl31C Knoxville, Tennessee 37902 Resident Inspector /Sequoyah NPS i
c/o U.S. Nuclear Regulatory Commission 2600 Igou Ferry Road Soddy Daisy, Tennessee 37379 o
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1 ENCt.05URE l.
(a) The Technical Specifications for Sequoyah I require the pump discharge pressure with recirculation throughout the minificw Ifne to be at least 2400 ps.g. whereas a discharge pressure of over 2600 psig might be expected from the FSAR. What is the basis for the value in Technical Specifications?
(b) For each centrifugal charging pump, provide information on the allowable ranges of pump head and/or flow and the initial reference values (see Table IWP-3100-2, INP-3210) that will be used for the Section XI inservice tests.
Is a lower limit for the reference value specified?
(c) Provide information on the allowances for pump degradation used in the safety analysis and describe how it is confirmed that this allowance is within that corresponding.to pump 1.imits allowed by the Technical Specifications and the Section XI tests for Sequoyah 1.
2.
In IE Bulletin 80-18. Item 2.d requires justificiition that " flow available from the CCPs with the modifications in place will be sufficient to justify continued applicability of any safety related analyses which take credit for flow from the CCPs (LOCA, HELB, etc.)."
For the small break LOCAs, the submittal refers toareducedsafeO injection flow rate of 45 gpm at 1250 psia because of the open mintflow line. However, since there are no plant limits.on flow through the mini-flow line, the actual flow rates at a given plant might be appreciably larger than this value due to errosion or sizing of the restricting orifice. Provide tests results for Sequoyah 1 to' confirm that the; flow rate is within the assumed limits.
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2 2-I 3.
For the small break LOCAs (2" less than diameter less than or equal to 6")
it is, stated that there is a 10*F PCT penalty if miniflow isolation is delayed 10 minutes and a PCT penalty of 200*F or more if no miniflow iso-lation occurs.
For the larger break sizes (6" less than diameter) it is stated that a 10 minute delay in miniflow isolation results in a PCT penalty of 40*F.
What PCT penalty results if no miniflow isolation occurs?
Ubat are the PCTs corresponding to the above PCT penalties?
4.
Provide larger copies of FSAR figures 9.3-13 and 9.3-20.
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